Autoinjector

Patent metadata

Field	Value
Publication number	US-2024131264-A1
Application number	US-202418404205-A
Country	US
Kind code	A1
Filing date	Jan 4, 2024
Priority date	Aug 14, 2012
Publication date	Apr 25, 2024
Grant date	—

Abstract

Described is an autoinjector comprising of a case, a motor adapted to rotate a drive gear, and a curvi-linear plunger adapted to mate with the drive gear. The plunger includes a distal end with a resilient flange, which in a non-deflected state, abuts a proximal collar of a syringe, and, in a deflected state, advances through the proximal collar and engages a stopper in the syringe.

First claim

1 . An autoinjector ( 1 ) comprising:
a case ( 2 ); a motor ( 15 ) adapted to rotate a drive gear ( 20 ); a curvi-linear plunger ( 18 ) adapted to mate with the drive gear ( 20 ), wherein the plunger ( 18 ) includes a distal end with a resilient flange, which in a non-deflected state, abuts a proximal collar ( 5 . 2 ) of a syringe ( 4 ), and, in a deflected state, advances through the proximal collar ( 5 . 2 ) and engages a stopper ( 19 ) in the syringe ( 4 ).

2 . The autoinjector ( 1 ) according to claim 1 , further comprising:
a door ( 22 ) adapted to cover an opening in the case ( 2 ) when the door is in a closed position.

3 . The autoinjector ( 1 ) according to claim 2 , further comprising:
a door spring ( 24 ) biasing the door ( 22 ) in an open position.

4 . The autoinjector ( 1 ) according to claim 2 or 3 , further comprising:
a releasable door latch ( 25 ) adapted to lock the door ( 22 ) in the closed position.

5 . The autoinjector ( 1 ) according to any of the preceding claims, further comprising:
a gear train ( 17 ) coupled to the motor ( 15 ), the gear train ( 17 ) including a linkage ( 17 . 2 ) having a threaded end adapted to mate with the drive gear ( 20 ).

6 . The autoinjector ( 1 ) according to any of the preceding claims, wherein the plunger ( 18 ) comprises a plurality of hinged links ( 18 . 2 ).

7 . The autoinjector ( 1 ) according to any of the preceding claims, further comprising:
a plurality of guides disposed within the case ( 2 ), wherein the plunger ( 18 ) engages the guides.

8 . The autoinjector ( 1 ) according to any of the preceding claims, further comprising:
an energy source ( 12 ) including a rechargeable or non-rechargeable battery.

9 . The autoinjector ( 1 ) according to any of the preceding claims, further comprising:
a retraction spring ( 28 ) biasing the syringe ( 4 ) in a retracted position within the case ( 2 ).

10 . The autoinjector ( 1 ) according to claim 2 , further comprising:
a boot removal mechanism ( 29 ) comprising:
a gear ( 30 ) adapted to rotate when the door ( 22 ) transitions from an open position to the closed position;
a rack ( 31 ) adapted to mate with the gear ( 30 ) and axially translate when the gear ( 30 ) rotates;
resilient locking beams ( 32 ) adapted to grip a needle boot ( 8 ) disposed on a needle ( 7 ) of the syringe ( 4 );
a boot removal spring ( 26 ) applying a biasing force to the rack ( 31 ).

11 . The autoinjector ( 1 ) according to claim 10 , wherein the boot removal spring ( 26 ) is compressed when the door ( 22 ) transitions from the open position to the closed position.

12 . The autoinjector ( 1 ) according to any of the preceding claims, further comprising:
a user interface adapted to provide at least one of visual and audible feedback and instruction.

13 . The autoinjector ( 1 ) according to any of the preceding claims, further comprising:
a sensor arrangement ( 27 ) adapted to detect proximity and properties of an injection site surface.

14 . The autoinjector ( 1 ) according to claim 13 , wherein the sensor arrangement ( 27 ) comprises:
at least one near infrared light emitting diode (LED) ( 27 . 1 ) adapted to illuminate the injection site surface; and a camera ( 27 . 3 ) adapted to obtain an image of the injection site surface.

15 . The autoinjector ( 1 ) according to claim 14 , wherein the sensor arrangement ( 27 ) further comprises:
a projector ( 27 . 2 ) adapted to display a pattern on the injection site surface.

Assignees

• Sanofi Aventis Deutschland

Inventors

• Henderson Charley
• Cross David
• Jennings Douglas Ivan
• Mcginley Ryan Anthony

Classifications

• A61M5/20 Primary

  Automatic syringes, e.g. with automatically actuated piston rod, with automatic needle injection, filling automatically (A61M5/142 {, A61M5/46} take precedence; {hypodermic projectiles F42B12/54}) · CPC title

• A61M5/3204

  Needle cap remover, i.e. devices to dislodge protection cover from needle or needle hub, e.g. deshielding devices · CPC title

• A61M5/427

  Locating point where body is to be pierced, e.g. vein location means using ultrasonic waves, injection site templates · CPC title

• A61M5/5086

  for indicating if defective, used, tampered with or unsterile · CPC title

• A61M2005/206

  With automatic needle insertion · CPC title